Replacing my Ultegra crank arms

FitzM
FitzM Posts: 232
edited June 2018 in Road buying advice
Can anyone confirm that should I chose to replace the Crank Arms on my Shimano Ultegra 6800 Chainset. To ensure the replacements (Shimano or other) fit do i need to consider anything other than that they need to be 4 bolt Gear arms?
Klein Quantum, Cervelo Soloist Team, Boardman SLR 9.0S, Boardman SLS 9.8, Kinesis Racelight 4S, DengFu FM028

Comments

  • svetty
    svetty Posts: 1,904
    Given that the driveside crank arm is attached to the spindle you are essentially talking about fitting a new chainset. In which case it depends on the BB which alternatives you can consider. Not sure why you'd replace just the arms unless the pedal threads are stripped?
    FFS! Harden up and grow a pair :D
  • imafatman
    imafatman Posts: 351
    It's probably cheaper/easier to just find a whole chainset, whether new or old.

    Not sure why you want to just change the cranks but keep the rings?
  • N0bodyOfTheGoat
    N0bodyOfTheGoat Posts: 6,065
    Some nice price, no idea on quality, cranksets at Merlin...
    https://www.merlincycles.com/road-bike- ... =price-min

    eg. £50 for 11-speed CX set with 36/46T, if you're happy with 175mm cranks.
    ================
    2020 Voodoo Marasa
    2017 Cube Attain GTC Pro Disc 2016
    2016 Voodoo Wazoo
  • FitzM
    FitzM Posts: 232
    Svetty wrote:
    Given that the driveside crank arm is attached to the spindle you are essentially talking about fitting a new chainset. In which case it depends on the BB which alternatives you can consider. Not sure why you'd replace just the arms unless the pedal threads are stripped?

    Across my three bikes I have 3 different crank arm lengths and just want to standardise so that they are all the same. Naturally the kit I remove I will sell.
    Klein Quantum, Cervelo Soloist Team, Boardman SLR 9.0S, Boardman SLS 9.8, Kinesis Racelight 4S, DengFu FM028
  • FitzM
    FitzM Posts: 232
    imafatman wrote:
    It's probably cheaper/easier to just find a whole chainset, whether new or old.

    Not sure why you want to just change the cranks but keep the rings?

    May well go down the purchase of the full chains, but thought I'd look to those that will be better informed to ask if just replacing the crank arms is an option. And if so what I need to consider.
    Klein Quantum, Cervelo Soloist Team, Boardman SLR 9.0S, Boardman SLS 9.8, Kinesis Racelight 4S, DengFu FM028
  • FitzM
    FitzM Posts: 232
    NitrousOxide wrote:
    Some nice price, no idea on quality, cranksets at Merlin...
    https://www.merlincycles.com/road-bike- ... =price-min

    eg. £50 for 11-speed CX set with 36/46T, if you're happy with 175mm cranks.

    I'm after 170mm, and have found new for as little as £119.95. Used is also an option, with eBay history suggesting about 50-60% of new cost.

    Hopefully this thread will provide me with enough feedback to make the best choice.
    Klein Quantum, Cervelo Soloist Team, Boardman SLR 9.0S, Boardman SLS 9.8, Kinesis Racelight 4S, DengFu FM028
  • N0bodyOfTheGoat
    N0bodyOfTheGoat Posts: 6,065
    FitzM wrote:
    NitrousOxide wrote:
    Some nice price, no idea on quality, cranksets at Merlin...
    https://www.merlincycles.com/road-bike- ... =price-min

    eg. £50 for 11-speed CX set with 36/46T, if you're happy with 175mm cranks.

    I'm after 170mm, and have found new for as little as £119.95. Used is also an option, with eBay history suggesting about 50-60% of new cost.

    Hopefully this thread will provide me with enough feedback to make the best choice.

    If you can live with 105, 170mm cranks are £77/90 for black and silver respectively.

    https://www.probikekit.co.uk/components ... eAscending
    ================
    2020 Voodoo Marasa
    2017 Cube Attain GTC Pro Disc 2016
    2016 Voodoo Wazoo

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